- Dairy Products - Wholesale & Retail, Massapequa
- Dams, Waterways, & Docks Contractors, Massapequa
- Dance Companies, Massapequa
- Data Communications Service, Equipment, Supplies & Sales, Massapequa
- Data Processing Services, Massapequa
- Day Spas, Massapequa
- Deck, Patio & Gazebo Design, Building, Cleaning, Repair & Maintenance Contractors, Massapequa
- Decorating & Designing Services, Massapequa
- Dehumidifying & Ventilating Equipment, Massapequa - Suppliers & Wholesalers
- Delicatessen Restaurants, Massapequa
- Dental Bonding & Cosmetic Dentistry, Massapequa - Cosmetic Dentist & Tooth Bonding
- Dentists, Massapequa
- Department Stores, Massapequa
- Dermatologists, Massapequa - Skin Doctors, Physicians & Surgeons (Dermatology)
- Developmental Children Services, Massapequa
- Developmental Disabilities, Massapequa
- Developmentally Disabled Information & Services, Massapequa
- Dictating Machines, Massapequa
- Diet Center, Massapequa
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- Diet Centers, Massapequa
- Diner Restaurants, Massapequa
- Disabled Persons Assistive Services, Massapequa
- Disc Jockeys, Massapequa
- Discount Stores, Massapequa - Clothing, Grocery, Furniture, Etc
- Divorce & Family Law Attorneys & Lawyers, Massapequa
- Dock Construction - Build & Repair, Massapequa - Dock Builders
- Doctors, Physicians & Surgeons, Massapequa
- Donuts, Massapequa
- Door & Gate Operating Devices, Massapequa
- Door Installation & Repair, Massapequa - Garage, Glass, Screen, Sliding, French, Closet, Front, Storm, Interior & Exterior Doors
- Drinking Establishments, Massapequa
- Drive In Restaurants, Massapequa
- Drugs, Pharmaceutical Products & Toiletries - Wholesale & Manufacturers, Massapequa
- Dry Cleaning & Laundry, Massapequa - Dry Cleaners
- Dry Well Contractors, Massapequa
- Drywall, Insulation & Plaster Contractors, Massapequa - Installation & Repair Services
- Dwelling Operators Except Apartment, Massapequa
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